Python full stack single-item loop

"""
 if conditional expression 1:
	 code1
 elif conditional expression 2:
	 code2
 elif conditional expression 3:
	 code3
 else:
	 `code4
 If condition expression 1 is true, execute the corresponding branch code1, otherwise determine whether condition expression 2 is true
 If condition expression 2 is true, execute the corresponding branch code2, otherwise determine whether condition expression 3 is true.
 If condition expression 3 is true, execute the corresponding branch code3. If it is not true, go directly to the else branch and execute the program.
 elif can be 0 or multiple
 else can be 0 or one
 """
youqian = False
youfang = False
youche = False
if youqian == True:
	print("It means this person is very powerful")
elif youfang == True:
	print("Can you give it to your friends?")
elif youche == True:
	print("We'll touch you after driving the Yadi Emma drives the car.")	
else:
	print("You'd better be a Meituan rider")
print("<=======================>")
###Nest-shaped branch"""Single-item branch, bidirectional branch, and inter-needing combination of multiple branches"""
youqian = True
youfang = True
youche = True
youyanzhi = True
youtili = False
if youqian == True:
	if youfang == True:
		if youche == True:
			if youyanzhi == True:
				if youtili == True:
					print("I want to marry you~")
				else:
					print("You go and have some big waist before you come~")
			else:	
				print("You go to Thailand + South Korea and have a plastic surgery")
else:
	print("You are a good person~")
	
print("<=======================>")
#Quoting height#Girls find a partner	# Boys are between 1 meter and 1.5 meters. Xiaoqiang Where are you?	# Boys are between 1.5 and 1.7 meters and feel insecure~	# Boys 1.7~1.8 meters handsome guy, leave a phone number	# Boys between 1.8~2 meters handsome guy, do you suggest you have an extra girlfriend?# python-specific (note: Because the numbers accepted by input are strings, and because we can enter decimals, we can only use float here)"""
height = float(input("Please enter your height:"))
if 1 <= height < 1.5:
	print("Xiaoqiang Where are you?")
elif 1.5 <= height < 1.7:
	print("Insecure~")
elif 1.7 <= height < 1.8:
	print("Handsome guy, leave a phone number")
elif 1.8 <= height < 2:
	print("Do you suggest an extra girlfriend?")
else:
	print("Sorry, there is no suitable option")
"""
# General writingheight = float(input("Please enter your height:"))
if 1 <= height and height < 1.5:
	print("Xiaoqiang Where are you?")
elif 1.5 <= height and height < 1.7:
	print("Insecure~")
elif 1.7 <= height and height < 1.8:
	print("Handsome guy, leave a phone number")
elif 1.8 <= height and height < 2:
	print("Do you suggest an extra girlfriend?")
else:
	print("Sorry, there is no suitable option")
"""
 tab indents right
 shift + tab indent left
 """

"""Features: Reduce redundant code and improve execution efficiency"""
"""
grammar:
while Conditional expression:
	code1
(1) Initialize a variable
(2) Write the condition for looping
(3) The value of self-increasing and self-decreasing
"""
# ### Print 1 ~ 100# (1) Initialize a variablei = 1
# (2) Write the condition for loopingwhile i <= 100:
	# (4) Write the logic of looping	print(i)
	# (3) Values ​​that increase and decrease	i += 1 # i = i + 1
"""
Code parsing:
First cycle
i = 1  i<=100 Decide true,Execute the loop body print(1)
i += 1 i => 2 
The second cycle
Code back to17OK,重新进OK条件判定 
i = 2  i<=100 Decide true,Execute the loop body print(2)
i += 1 i => 3
The third cycle
Code back to17OK,重新进OK条件判定 
i = 3  i<=100 Decide true,Execute the loop body print(3)
i += 1 i => 4
....
And so on 
untili = 101  i <= 100 Decided as false,不Execute the loop body,End of this cycle...
1 ~ 100
"""
#### 1 ~ 100 cumulative sum# (1) Initialize a variablei = 1
total = 0
# (2) Write the condition for loopingwhile i <= 100 :
	# (4) Write custom logic	total += i
	# (3) Values ​​that increase and decrease	i += 1
print(total)
"""
Code parsing:
First cycle
i = 1 i <= 100 Determined as trueTrue Execute the loop body total += i => total = total + i => 0 + 1
i += 1  => i = 2
The second cycle
i = 2 i <= 100 Determined as trueTrue Execute the loop body total += i => total = total + i => 0 + 1 + 2
i += 1  => i = 3
The third cycle
i = 3 i <= 100 Determined as trueTrue Execute the loop body total += i => total = total + i => 0 + 1 + 2 + 3 
i += 1  => i = 4
...
Analogous in sequence
wheni = 101 101 <= 100 Decided as falseFalse 不Execute the loop body,Here,End of the loop..
total += i => total + i => 0 + 1 + 2 + 3 + 4 + .... + 100 => 5050
"""

#Ending cycle"""
while True:
	print(1)
"""

#### Use the method of a dead loop to achieve 1 to 100 cumulative sumi = 1
total = 0
sign = True
while sign:
	total += i
	i+=1
	# Determine whether i is added to 101, and do not participate in the loop	if i == 101:
		# Terminate the loop		sign = False
print(total) #1 ~ 100 = 5050

# (1) Print a line of ten small stars* help(print)# help View a method's documentationhelp(print)
"""
# print("*",end='')
# print("*",end='')
# print("*",end='')
# print("*",end='')
# print("*",end='')
# print("*",end='')
# print("*",end='')
# print("*",end='')
# print("*",end='')
# print("*",end='')
"""
i = 0
while i<10:	
	# end='' When printing, no line breaks are added at the end by default	print("*",end='')	
	i += 1
# Default line break# print()
# (2) Display a row of ten small stars by printing a variableprint("<======>")
i = 0
strvar = ""
while i < 10:
	# Write the logic of loop	strvar += "*" # strvar = strvar + "*"
	i +=1
print(strvar)
"""
strvar += "*" => strvar = "*"
strvar += "*" => strvar = "*" + "*"  = "**"
strvar += "*" => strvar = "**" + "*" = "***"
...
strvar += "*" => strvar = "********" + "*" = "*********"
"""
# (3) Ten color-changing stars in a row ★☆★☆★☆★☆★☆★☆★☆★☆"""
# Method 1i = 0
while i < 5:
	print("★☆",end="")
	i+=1
"""
# Method 2i = 0
while i < 10:
	if i % 2 == 0 :
		print("★",end="")
	else:
		print("☆",end="")
	i+=1
print("<=============>")
# Method 3i = 0
strvar = ""
while i < 10:
	if i % 2 == 0 :
		strvar += "★"
	else:
		strvar += "☆"
	i+=1
print(strvar)
"""
***formula: Any number and n Take the remaining,Range of remainder: 0 ~ (n-1)***
0 % 2 = 0
1 % 2 = 1
2 % 2 = 0
3 % 2 = 1
Divided % 2 => 0 or 1
0 % 5 = 0 
1 % 5 = 1
2 % 5 = 2
3 % 5 = 3
4 % 5 = 4
5 % 5 = 0 
6 % 5 = 1
7 % 5 = 2
Divided % 5 => 0 or 1,2,3,4
"""
# (4) Use a loop to print ten rows and ten columns of small stars"""
★★★★★★★★★★
★★★★★★★★★★
★★★★★★★★★★
★★★★★★★★★★
★★★★★★★★★★
★★★★★★★★★★
★★★★★★★★★★
★★★★★★★★★★
★★★★★★★★★★
★★★★★★★★★★
"""
# Method 1i = 0 
while i < 100:
	# Logic is written here	print("*" , end="")
	# Print newline (on 9 19 29 .. 99 )	if i % 10 == 9:
		print()
	i += 1 

"""
0123456789
**********
10111213141516171819
**********
20212223242526272829
**********
...
90919293949596979899
**********
9 19 29 39 49 59 69 79 89 99
9 % 10  = 9
19 % 10 = 9
29 % 10 = 9
...
99 % 10 = 9
"""

print("<======>")
# Method 2i = 1
while i <= 100:
	# Logic is written here	print("*" , end="")
	# Print newline (on 9 19 29 .. 99 )	if i % 10 == 0:
		print()
	i += 1 
"""
12345678910
**********
11121314151617181920
**********
21222324252627282930
**********
...
919293949596979899100
**********
10 20 30 ... 100
"""
# (5) A loop implements the small stars with ten rows and ten columns, and the color of the grid is replaced."""
★☆★☆★☆★☆★☆
★☆★☆★☆★☆★☆
★☆★☆★☆★☆★☆
★☆★☆★☆★☆★☆
★☆★☆★☆★☆★☆
★☆★☆★☆★☆★☆
★☆★☆★☆★☆★☆
★☆★☆★☆★☆★☆
★☆★☆★☆★☆★☆
★☆★☆★☆★☆★☆
"""
i = 0 
while i < 100:
	# (1) Print stars	if i % 2 == 0 :
		print("★",end="")
	else:
		print("☆",end="")
	# (2) Print newline (on 9 19 29 .. 99 )	if i % 10 == 9:
		print()
	i += 1 
# (6) A loop implements ten rows and ten columns, interlaced colors and small stars"""
★★★★★★★★★★
☆☆☆☆☆☆☆☆☆☆
★★★★★★★★★★
☆☆☆☆☆☆☆☆☆☆
★★★★★★★★★★
☆☆☆☆☆☆☆☆☆☆
★★★★★★★★★★
☆☆☆☆☆☆☆☆☆☆
★★★★★★★★★★
☆☆☆☆☆☆☆☆☆☆
*** formula:Any numberandnDelete the floor,Will appearnThe same number
0 // 10 = 0
1 // 10 = 0
2 // 10 = 0
..
9 // 10 = 0
0 ~ 9 // 10 => 0 (10 same 0)10 // 10 = 1
11 // 10 = 1
12 // 10 = 1
...
19 // 10 = 1
10 ~ 19 // 10 => 1 (10 same 1).... And so on
20 ~ 29 // 10 => 2 (10 same 2)30 ~ 39 // 10 => 3 (10 same 3)40 ~ 49 // 10 => 4 (10 same 4)...
90 ~ 99 // 10 => 9 (10 same 9)0~ 100 Will appear10The same0,1,2 , 3 ... 9 
0 // 3 0
1 // 3 0
2 // 3 0
3 // 3 1
4 // 3 1
5 // 3 1 
"""
""""""
# Method 1i = 0 
while i < 100:
	# (1) Print stars	if i // 10 % 2 == 0:
		print("★",end="")
	else:
		print("☆",end="")
	# (2) Print newline (on 9 19 29 .. 99 )	if i % 10 == 9:
		print()
	i += 1 
# Method 2print("<=================>")
i = 10
while i < 110:
	# Print stars	num = int(str(i)[-2])
	if num % 2 == 0 :
		print("★",end="")
	else:
		print("☆",end="")
	# Print line break	if i % 10 == 9:
		print()
	i+=1
"""
10 ~ 100 101 102 103 110...
10 ~ 19 => 1
20 ~ 29 => 2
30 ~ 39 => 3
90 ~ 99 => 9
100 ~ 109 => 0
"""

# (1) String splicing +str1 = "Zhao Shenyang,"
str2 = "so strong"
res = str1 + str2
res = "Zhao Shenyang," + "so strong"
print(res)
# res = res + ", the classmates next to him like him very much ~"res += ", the classmates next to him like him very much~"
print(res)
# (2) Repeat of string *strvar = "Say important things three times~"
res = strvar * 3
print(res)
# (3) String cross-line splicing \str1 = "kskfjskjfklsjfklasdjklfjaskldjfaskljfklasjdfklasjdklfjaskldfjaskldjflasjfsf" \
"1122334"
print(str1)
# (4) Index of strings#          0 1 2 3 4 5
strvar = "Zhao Shichao is so handsome"
#         -6-5-4-3-2-1
print(strvar[1])
# (5) Slice of string: (intercepted)"""
grammar => String[::]  Full format：[Start indexing:End index:Interval value]
	(1)[Start indexing:]  从Start indexing截取到String的最后
	(2)[:End index]  从开头截取到End index之前(End index-1)
	(3)[Start indexing:End index]  从Start indexing截取到End index之前(End index-1)
	(4)[Start indexing:End index:Interval value]  从Start indexing截取到End index之前按照指定的间隔截取字符
	(5)[:]or[::]  截取所有String
"""
strvar = "Wang Wen is the most perfect, flawless, kind, beautiful, handsome, handsome, handsome, handsome, elegant, and suave mysterious boy in this universe."
# (1)[Start Index:] Intercept from the start index to the end of the stringres = strvar[3:]
print(res)
# (2)[:End Index] Before intercepting from the beginning to the end index (End Index-1)"""The maximum value of 4 itself cannot be obtained. To obtain the data before 4: take the head and leave the tail"""
res = strvar[:5]
print(res)
# (3) [Start Index: End Index] Before intercepting from the start index to the end index (end index-1)res = strvar[10:16]
print(res)
# (4)[Start Index: End Index: Interval Value] Snap characters at the specified interval before intercepting the start index to the end index# Intercept from left to rightres = strvar[::3]
# 0 3 6 9 12 15 ... 
print(res)
# Intercept from right to leftres = strvar[::-1]
# -1 -2 -3 -4 -5 -6 .... 
print(res)
res = strvar[-3:-10:-2]
# -3 -5 -7 -9 The Secret Painprint(res)
print("<====>")
"""From left to right, the interval value is positive, and conversely, the interval value is negative, so that the data can be intercepted"""
"""
res = strvar[-3:-10:10] # Error logicprint(res)
res = strvar[1:10]
print(res)
"""

1.A game that guesses the size：
Set an ideal number, for example：66，Let the user enter numbers，If66big，则显示猜测的结果big了；If66Small，则显示猜测的结果Small了;Only equal to66，Show correct guess results。
2.Output 1-100 All odd numbers within
3.Output 1-100 All even numbers within
4.User login（Three chances of losing wrong）And each time an error is entered, the remaining error count is displayed（hint：Format using string）
5.Write code，There are the following strings that use slices to achieve each function
strvar = "132a4b5c"
1)Slice the string to form a new string "132"
2)Slice the string to form a new string "a4b"
3)Slice the string to form a new string "1245"
4)Slice the string to form a new string "3ab"
5)Slice the string to form a new string "c"
6)Slice the string to form a new string "ba3"
6.International chessboard effect

# 1. Guess the size of the game:# Set an ideal number such as: 66, let the user enter the number. If it is larger than 66, the guess result will be larger; if it is smaller than 66, the guess result will be smaller; if it is smaller than 66, the guess result will be correct."""
num = 66
str_num = input("Please enter the ideal number")
num_new = int(str_num)
if num_new > num:
	print("The guess is big")
elif num_new == num:
	print("Show the guess results are correct")
elif num_new < 66:
	print("The result of the guess is smaller")
"""

# 2. Output all odd numbers within 1-100"""
i = 1
while i <= 100:
	if i % 2 == 1:
		print(i)
	i +=1
"""
# 3. Output all even numbers within 1-100"""
i = 1
while i <= 100:
	if i % 2 == 0:
		print(i)
	i +=1
"""
# 4. User login (there are three chances of error input) and the remaining error count is displayed every time the error input is entered (tip: use string formatting)"""
times = 1
while times <= 3:
	pwd = input("Please enter your password:")
	if pwd == "111":
		print("Congratulations on logging in successfully~")
		break
	# Remaining times = Total times - Number of times already used	print("Your remaining input is %d" % (3 - times))	
	times +=1
"""
"""
sign = True
times = 1
while sign:
	pwd = input("Please enter your password:")
	if pwd == "111":
		print("Congratulations on logging in successfully~")
		sign = False
	else:
		# Remaining times = Total times - Number of times already used		print("Your remaining input is %d" % (3 - times))
	# If the number of times is already 3 times, force the loop to be terminated;	if times == 3:
		print("You no longer have a chance...")
		sign = False	
	times +=1
"""
# 5. Write code, with the following strings to implement each function using slicesstrvar = "132a4b5c"
# 1) Slice the string to form a new string "132"print(strvar[0:3])
# 2) Slice the string to form a new string "a4b"print(strvar[3:6])
# 3) Slice the string to form a new string "1245"print(strvar[::2])
# 4) Slice the string to form a new string "3ab"print(strvar[1:6:2])
#5) Slice the string to form a new string "c"print(strvar[-1:])
# 6) Slice the string to form a new string "ba3"print(strvar[-3::-2]) # -3 -5 -7 
# 6. International chessboard effects# Method 1j = 0
while j < 8:	
	# □■□■□■□■
	if j % 2 == 0:
		print("□■□■□■□■",end="")			
	# ■□■□■□■□
	else:
		print("■□■□■□■□",end="")
	print()
	j +=1
"""
# □■□■□■□■
i = 0		
while i < 8:
	if i % 2 == 0:
		print("□",end="")
	else:
		print("■",end="")
	i +=1 
# ■□■□■□■□
i = 0		
while i < 8:
	if i % 2 == 0:
		print("■",end="")				
	else:
		print("□",end="")
	i +=1 
"""
print("<=====>")
j = 0
while j < 8:	
	# □■□■□■□■
	if j % 2 == 0:
		i = 0		
		while i < 8:
			if i % 2 == 0:
				print("□",end="")
			else:
				print("■",end="")
			i +=1 		
	# ■□■□■□■□
	else:
		i = 0		
		while i < 8:
			if i % 2 == 0:
				print("■",end="")				
			else:
				print("□",end="")
			i +=1 
	print()
	j +=1

# Method 2"""
□■□■□■□■
■□■□■□■□
□■□■□■□■
■□■□■□■□
□■□■□■□■
■□■□■□■□
□■□■□■□■
■□■□■□■□
"""
print("<=====>")
i = 0
while i < 64:
	# Determine whether it is an odd or even line	if i // 8 % 2 == 0:
		# □■□■□■□■
		if i % 2 == 0:
			print("□",end="")
		else:
			print("■",end="")
	else:
		# ■□■□■□■□
		if i % 2 == 0:
			print("■",end="")			
		else:
			print("□",end="")
	#Eighth block line break	if i % 8 == 7:
		print()		
	i +=1
print("<=====>")
# Method 3i = 0
while i < 4:
	strvar = ""
	j = 0
	# Print small squares in black and white	while j < 8:
		if j % 2 == 0:
			strvar += "□"
		else:
			strvar += "■"
		j +=1
	# Forward printing	print(strvar)
	# Reverse printing	print(strvar[::-1])
	i +=1